Error 109 (net::ERR_ADDRESS_UNREACHABLE): Unable to reach the server. other site wiil open but one site are not open please hepp

This is more likely to be an internet connection problem rather than a router issue. is your internet intermittent?

Here are the simple steps to take.
error 105 Unable to resolve the server DNS address

It means that the browser is unable to resolve the name you are trying to reach. It could be an incorrect proxy setting in your browser, or a problem where antivirus or a firewall is blocking the address or possibly a network problem with your connection or a setting in your router if you are using one.

To eliminate all possible causes except browser, try going to the same address using a different browser, if that works, then it is a browser setting problem.
If that does not work, then try turning off firewall and antivirus briefly and see if it works. If it does work, then it is a firewall or antivirus problem, turning off one at a time will determine which is the cause.

If that does not work, then it may be a problem with your NIC card not getting an address. To check that on windows use start,run and type in cmd, then in the black window type in ipconfig /all and see what address is displayed. If it is all zeros or a 169.254.***.*** address then it is a connection problem. If it displays a proper address, then the next possible place could be in a router setting or an incorrect DNS setting.

Router status should display all connection information if i is working properly, the WAN address must have an IP for it to work. If it is all zeros then refresh or turning it off and then on may reset the connection.

If you are using Google Chrome browser turning off "use IPV6" in the settings may cause it to work again.

your internet connection is probably having a problem or the actual site you are trying to access is down. Another possible reason is incorrect address.

It sounds like you are having a problem with Yahoo.
Have you ever thought about changing your e-mail address to google.com? Google

Is Frontier your communications company? I suggest getting a Gmail account.

Sites that I have accessed for ages are now not coming up sometimes its say's"the web page is temporarily down or removed' and for more information I get Err 105 etc'. These pages are not down and the address is correct, if I try it a few times it often starts to work. I also may be in a site eg: Daily telegraph or net bank and when I try another page within the site it often comes up 'temporarily unavailable' which is not true again and it usually gives me a reference number. What can I do?

Most SMTP-servers will give "permission" to be used only when your computer is connected via an IP-address assigned to you (statically or dynamically) by the Internet Service Provider.

So, if you are using wireless Internet access, maybe provided at some retail location, rather than connected by Ethernet cable to '012.NET.IL', or wirelessly within your own home, using your own wireless router, you will get this error-message, when you try to "send" E-mail.

DNS = Domain Name Server

This is a set of specialized servers on the Internet, needed to
translate user friendly internet address such as:

www.microsoft.com

into their binary IP address equivalents, such as:

www.microsoft.com =
207.46.192.254 = (IP address)
$CF 2E C0 FE = (hexadecimal)
1100 1111 0010 1110 1100 0000 1111 1110 (binary)



In order to communicate with Microsoft, your computer
first sends a request to the closest DNS server to resolve
the domain name into a binary address. Once it gets the
binary address of Microsoft, in then prefixes every packet
with a 32-bit destination address, followed by it own 32-bit
return address.

Other specialized computers on the Internet, called routers,
than manage the actual data transfers on a skip by skip basis.

===========

A DNS error means that your computer is either unable to reach
the pre-determined DNS server, or the server is unable to resolve
the particular address due to a non-existent WEB site or a
spelling mistake.

The actual meaning of the message depends on which layer
of the internet protocol in your computer, (or outside of it)
generated it.

Martin.